Rotary pump



M. BOGRE ROTARY PUMP July 7, 1925. Y 1,544,629

Filed- Jun'ex s, 1924 Patented July 7, y1925. i

'i UNITED vS'I''I'ES "PATENT foi-rica l MICHAEL BoeRE, or nE'rnoI'r,MICHIGAN. l

ROTARY PUMP.

Application ld .Tune 3, 1924. Serial No. 718,746.

2,10. all 'whomt may concern: y

Be it known that I, MICHAEL- BoGRE, a citizen of the United States,residin at Detroit, in the county of lYayne and tate of Michigan, haveinvented certain new and useful Improvements in Rotary Pumps, ofwhich'the following isa specificatiomreference being had thereinv toqtheaccompanying drawings. l

This invention relates tofpumpsor com pressors ofthe type whereina'cylindrical casing houses an eccentricprovided with a win ed strap,thefwing of `Which reciproca 1y oscillates in a chambery lateral to themain chamber of the ypump and the .strap moves in rotary contact "withthe inner circumferential wall of the cylinder, whereby upon therotation of the eccentric progres' sively and inversely'varying chambers'are provided on opposite sides of the said wing.

This form of pum as heretofore constructed, has offered j ifiicultiesinpacking the eccentric strap in order to prevent'or reduce losses dueto leakage from one 'chamber to the other, and the objects of thisinvention are, thereforefto 'providea form of packing and a method ofadjustment of the stra whereby the same may be better fitted within thecasing and whereby wear between the .contacting surfaces may be takenup.

- -A further Object ist() previas fo'fh ea'- cient lubrication of suchsurfaces subjected to wear, and a still further object is to provide fora positive closing olf of communication between the inlet and the'interior chambers of the pump during the movement of the strap followingthe completion of one.

' which eccentric is movable and adapted to be adjustably spaced fromthe iixed part thereof to increase the throw of the/ eccentric wherebythe throw of the stra may be accordingly increased to effect a justmentof or take up wear between the saidstrap and its surrounding casing, thewing of the strap extending into an oscillating valve member and havingan inlet duct therein which terminates at a desired distance from saidstrap, whereby said duct will be closed by said valve member when thesaid strap assumes a position adjacent the said f valve member. All ofwhich is more particularly described and ascertained hereinafter, by Wayof example, having reference to the accompanying drawing, whereinjFigure l is a sectional elevation of a pump embodying said invention;

Figure 2 is a transverse section of the same;

Figure 3 is. a section on the line 3*-3* of Figure 2; i. i

Figure 4 isa perspective view of the winged eccentric sty-rap removed,and

-Figure 5 is a detail perspective view of one of the packing ringsremoved. Similar characters of reference indicate similar parts drawing.

1 is a pump casing comprisinga body portion 2 and a; cover-plate 3secured thereto by pins 4, the said-casing incorporating a cylin theseveral figures of they inder having a smaller communicating cy- `theorifice 7 of the oscillating) valve member 6, the said strap co-actingwith the outer wall of the casing sothat two chambers -,a,- and `-b'-are provided on yopposite sidesv of therwing 13 which chambers varyin'inverse relative capacity as the eccentric -rotates thereby effectmgapumping operation in the manner well known in the art.

14' is ,an inlet duct on'one side. of the said strap and 15 an outletfrom the chamber -b' on the opposite side'of the said strap. 16 isanon-return check valve seated in the said outlet.

It'isl desirable that the strap 12 -be adjustable with respect to theperipheral wall ofithis casing in order to prevent leakage between thechambers afand r--, and this I effect by varying the throw of theeccentric-11 which in this case comprises a fixed part lland a radiallymovable segment 11", the complete eccentric being of somewhat smallerdiameter than the internal diameter of the strap to allow of axialvariation between the said eccentric .and strap when adjustment is beingmade, 1'?l being tapered threaded pins entering between the parts '11,11b and adapted to adjustably edect the spacing ot the said part 1i'sfrom the part 11la toiaccomplish the desired result. It will be apparentthat peripheral wear of the strap, or oi the -coacting wall of thecasing may readily be taken up by entering the tapered pins 17 furtherinto the strap.

Lateral packing of the strap is eected by the use of winged rings orplates 18 acl commodated in correspondingly shaped recesses 19 in thesides. of the said strap 12 and wing 13 thereof, these plates beingoutwardly pressed against the sides of the cas` ing by springs 20accommodated in transverse chambers 21 in the said strapgcand to secureecient lubrication `of the internal parts of the pump l propose toprovide the said chambers 2i with oil disks 22 leading thereto from thebore of the eccentric and communicating with ducts 23 and 24: in. theeccentric and shaft. f

Where compressible fluids, such as air, are pumped by' the device therewould ordinarily be a tendency of the iiu'id in the chamber exerting aback pressure through the inlet when the strap is in an intermediateposition between the completion of each stroke, namely, when the saidstrapis oscillating in its closest positions to the member 6 as at suchtimes the outlet 15 would be open to the entire space around the saidstrap, this position being indicated in dotted lines in Figure 2g Toovercome this objection the inlet duct 1li terminates at a shortdistance :trom the strap and forms a closure Q5 which enters theosciliatory member 6 mancate thereby eiectually cutting off, for thetime being communication between the inlet and outlet orifices.

w This invention may be developed within the scope of the followingclaims without departing from the essential features ci the saidinvention and it is desired that the specification and drawing be readas being merelyvillustrative and not in :1t-limiting sense except asnecessitated by the prior art.

1., In a. device of the class described, a winged strap, an oscillatoryvalve member entered by the wing of said strap, said wing having aninlet duct therein, land a closure shutting' off communication throughsaid duct when said strap is in its most adjacentreiation to said valvemember., i

2. In a device of ,the class described, a winged strap, an oscillatoryvalve member entered by the wing of said strap, said wing having aninlet duct in one side thereof and said oscillatory member provided witha lateral inlet orifice communicating. than,m with, and a closure at theupper end of said duct 'extending radially beyond the periphery of saidwinged strap and adapted to enter said oscillatory valve member and'shut ofi" communication through said duet as the said strap cioseiyapproaches and recedes *from said oscillatcry memben lin testimonywhereof I aiiix my signature presence et two witnessesa menant nonnaeWitnesses s Lewis ANNA M. Henn,

